Wrap a macro's args in parentheses. No binary change.

I'm discussing with deraadt@ whether it's a good idea to convert some of
these to functions. The one changed by this commit probably isn't
eligible because it defines only a for loop's condition, but many others
in less(1) should probably be converted.

ok millert@

1 files changed, 2 insertions, 2 deletions

diff --git a/usr.bin/less/ch.c b/usr.bin/less/ch.c
index 86500972b4d..7262ca87932 100644
--- a/usr.bin/less/ch.c
+++ b/usr.bin/less/ch.c
@@ -103,8 +103,8 @@ struct filestate {
  * Macros to manipulate the list of buffers in thisfile->hashtbl[n].
  */
 #define	FOR_BUFS_IN_CHAIN(h, bn) \
-	for (bn = thisfile->hashtbl[h].hnext;  \
-	    bn != END_OF_HCHAIN(h);  bn = bn->hnext)
+	for ((bn) = thisfile->hashtbl[h].hnext;  \
+	    (bn) != END_OF_HCHAIN(h); (bn) = (bn)->hnext)
 
 #define	BUF_HASH_RM(bn) \
 	(bn)->hnext->hprev = (bn)->hprev; \